Electrode.



"J. T. H. DEMPSTER.

ELECTRODE.

APPLIOATION FILED MAY 20,1004.

1,118,399, Patented NOV. 24, 1914.

Fig.5.

Witnesses: Inverfuor:v

52/ 2Z John T. H.Dempster,

' good ieshlts uni elcinint h neuclly occurs in variable quantities i amounts. Chroni'st H ..o1ne magnesia and c. smell percentage other materials. f linstcad oi chromite l have used for restrainer a mixture contaiiiing one oi magnesia. and four parts of CODTJHQFQlJEl chromium cizid With excellent results, have also used commercial chromium oiiid unmixed with other materials. Commercial chromium oxid,-however, does not seem to give as good results as chromite containing; but a sinall amount of aluminum oxid or e mixture of commerciel chromium osid and magnesia.

in the specific compositions of electrode which I have herein described the iron of the magnetite is the base or foundation which primarily furnishes and feeds the arc; the titanium contained in its onid serves to intensify the luminosity of the arciurnished by the base and is, therefore, the intensifier of the electrode composition, and the chromium in its oxid or in the chromite serves to retard the consumption of the electrode and is, therefore, the base of the rcstrainer, of the electrode composition. .lilach element has thus adistinct function, and the? greatest utility of my electrode is obtained from. the simultaneous performonce of these functions, although my invention, in its broader aspect, not limited thereto.' v While the electrodes formed oithe Ina. lm-ials above specified and in the proporiions mentioned give very excellent results Moth as to luminosity and life, good elec modes can he made of other materials and in other proportions in which the use of et etreiner of cherlcter specified is highly advantageous, enci ll do not intend that the heneinaiter made shall he limited to the particular electrode described more than may he made necessary by the state of the 1. An z rcdight electrode consisting essentially of an are maintaining body of terric and titanic material, and 2. small amount of a restrainer having chromium as its base intimately mixed with said meterial, whereby the consumption of the elec: trode is retarded.

2. An arc-light electrode consisting of an are maintaining hody composed essentially of magnetite and titanium oxid, and a small amount of a restrainercontaining chromium oxid intimately mixed with the are maintaining body whereby the consumption of the electrode 1s retarded.

8. An arc-light electrode consisting of an are maintaining body essentially composed of e mixture of magnetite and titanic meterial, with an addition of a chromium compound in einount less than one-ninth of the total Weight of the electrode, whereby the consumption of the'electrode is retarded. in itness whereof, I have hereunto set my hand this 18th'dey of May, 1904. JOHN H. DEMPSTER.

' eminine B l-lump,

l Unseen. 

